This port is located in not-so modern SUN Sparcs such as SUN LX/Classic/SS4/5/10/20 and has both serial ports (A/B) in the same connector. Simply plugging in a regular serial cable in results in accessing port A.
 (at the computer)
 (at the computer)
25 PIN D-SUB FEMALE at the computer.
| Pin | Name | Port | Dir | Description | 
|---|---|---|---|---|
| 2 | TXD | A |  | Transmit Data | 
| 3 | RXD | A |  | Receive Data | 
| 4 | RTS | A |  | Request to Send | 
| 5 | CTS | A |  | Clear to Send | 
| 6 | DSR | A |  | Data Set Ready | 
| 7 | GND | - | - | System Ground | 
| 8 | CD | A |  | Carrier Detect | 
| 11 | DTR | B |  | Data Terminal Ready | 
| 12 | CD | B |  | Carrier Detect | 
| 13 | CTS | B |  | Clear to Send | 
| 14 | TXD | B |  | Transmit Data | 
| 15 | TC | A |  | Transmit Clock from DCE, usually not used | 
| 16 | RXD | B |  | Receive Data | 
| 17 | RC | A |  | Receive Clock from DCE, usually not used | 
| 18 | TC | B |  | Transmit Clock from DCE, usually not used | 
| 19 | RTS | B |  | Request to Send | 
| 20 | DTR | A |  | Data Terminal Ready | 
| 21 | TCO | A |  | Transmit Clock from DTE, usually not used. | 
| 25 | TCO | B |  | Transmit Clock from DTE, usually not used. | 
  Note: Direction is DTE (Computer) relative DCE (Modem).
    Note: Do not connect SHIELD(1) to GND(7).
| Contributor: | Niklas Edmundsson | 
| Source: | SUN Field Engineer Handbook, VolumeII, 12/15/93 | 
  Copyright © The Hardware Book Team 1996-2004.
  May be copied and redistributed, partially or in whole, as appropriate.
  Document last modified: 2002-01-13